#introduce_page{  
    background:rgb(10, 10, 10);  
    border: solid 1px rgba(0,0,0,0);
}   

#banner{
    width: 50%;
    height: 75%;
    border: solid 1px rgba(0,0,0,0);
    vertical-align: middle;
    /* 垂直居中banner */
    position: relative;
    left: 50%; /* 定位父级的50% */
    top: 60%;
    transform: translate(-50%,-50%); /*自己的50% */
    color: aliceblue;
}

#pic{
    width: 70%;
    height: 100%;
    float: left;
    border: solid 1px rgba(238,238,238,0.13);
    position: relative;
}

#word{
    width: 20%;
    height: 50%;
    float: right;
    border: solid 1px rgba(238,238,238,0.13);
    margin: auto;  
    /* 垂直居中靠右文字介绍 */
    position: absolute;  
    top: 0;bottom: 0; right: 0; 

}

#prve{
    /* 垂直居中靠左切换按钮*/
    position: absolute;
    top:0;
    left: 0;
    bottom: 0;
    margin: auto;
    text-align: center;
}

#next{
      /* 垂直居中靠右切换按钮 */
    position: absolute;
    top:0;
    right: 0;
    bottom: 0;
    margin: auto;
    text-align: center;
}

#introduce_page > a{
    width: 40px;
    height: 40px;    
    text-decoration: none;
    font-size: 30px;
    background: #000000;
    color: #ffffff;
    filter: alpha(opacity 40);
    opacity: 0.4;
}

#introduce_page a:hover{
    filter: alpha(opacity 90);
    opacity: 0.9;
}

#introduce_page > #banner > #pic > img{
    height: 100%;
    width: 100%;
}

#p,#span{
    width: 100%;
    height: 30px;
    filter:alpha(opacity 40);
    opacity: 0.4;
    background-color: black;
    color: #ffffff;
    text-align: center;
    line-height: 30px;
    border: solid 1px rgba(0,0,0,0);
}

#span{
    position: absolute;
    top:0;
}
#p{
    position: absolute;
    left: 0;right: 0;
    bottom: 0;margin: auto;
} 


#ul{
    margin: 0;
    padding: 0;
    width:14%;
    height: 30%;
    text-align: center;
    border: solid 1px rgba(0,0,0,0);
    position: absolute;
    right: 0;left: 0;bottom: 30px;
    margin: auto;
    height: 20px;
}

#ul li {
    width: 13px;
    height: 13px;
    list-style: none;
    border-radius: 100%;
    float: left;
    margin:0 2px;
    border: 1px #ccc solid;
    
}

.on{
    background-color: #ffffff;
}

@media screen and (max-width:1920px){
    #banner{
        width: 60%;
        height: 75%;
    }
}


@media screen and (max-width:1440px){
    #banner{
        width: 70%;
        height: 70%;
    }
}

@media only screen and (max-width:1120px) {
    #banner{
        width: 80%;
        height:80%;
    }
   
}
@media only screen and (max-width:978px) {
    #ul{
        width:20%;
    }
   
}

@media only screen and (max-width:414px) {
    #banner{
        width: 100%;
        height: 80%;
    }
    #pic{
        width: 100%;
        height: 70%;
        clear: both;
        border: solid 1px rgba(238,238,238,0.13);
        position: relative;
    }
    
    #word{
        width: 100%;
        height: 25%;
        clear: both;
        position: relative;
        bottom: 0;
    }
    #ul{
        width:20%;
    }
   
}

@media only screen and (max-width:414px) {
    #ul li{
        width:12px;
        height: 12px;
    }
}